Patent US4239643A successfully refreshed from Google Patents.
US4239643A
Expired / Lapsed
US
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Peroxide stabilization
Assignee: Monsanto Co
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Filing: 1979-01-02
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Granted: 1980-12-16
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Expires: 1999-01-02
Abstract
Abstract In aqueous peroxide-containing solutions used in bleaching of cellulose fiber, peroxide stability is very greatly increased by inclusion of alkali metal polyphosphate and alkali metal diethylene triamine penta(methylene phosphonate). Especially useful for addition of such stabilizers to the peroxide-containing solutions to increase such stability are essentially anhydrous compositions containing metal sequestering compounds comprising such polyphosphate and phosphonate in a weight ratio from about 10:1 to about 1:5.
Inventors
- 👤 Xavier Kowalski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:26
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/39; C11D3/3902; C11D3/3937; C11D3/394; C01; C01B; C01B15/00; C01B15/01; C01B15/037; D; D06; D06L; D06L4/00; D06L4/10; D06L4/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
35 words
An essentially anhydrous composition containing metal sequestering compounds comprising alkali metal polyphosphate and alkali metal diethylene triamine penta(methylene phosphonate) in a weight ratio of said polyphosphate to said phosphonate from about 10:1 to about 1:5.
Claim 2
Dependent Claim
35 words
An essentially anhydrous composition containing metal sequestering compounds comprising alkali metal polyphosphate and alkali metal diethylene triamine penta(methylene phosphonate) in a weight ratio of said polyphosphate to said phosphonate from about 10:1 to about 1:5.
Claim 3
Dependent Claim
11 words
Composition of claim 1 wherein said polyphosphate is predominantly sodium tripolyphosphate.
Claim 4
Dependent Claim
14 words
Composition of claim 1, said compounds consisting essentially of said polyphosphate and said phosphonate.
Claim 5
Dependent Claim
26 words
Composition of claim 3 wherein said ratio is from about 5:1 to about 1:2, said phosphonate consisting essentially of sodium or potassium diethylene triamine penta(methylene phosphonate).
Claim 6
Dependent Claim
11 words
Composition of claim 4 wherein said polyphosphate is essentially sodium tripolyphosphate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |